*{box-sizing:border-box}

html{scroll-behavior:smooth}

body{

  margin:0;

  font-family:Arial,Helvetica,sans-serif;

  background:#f6f8fc;

  color:#172033;

  line-height:1.7;

}

a{text-decoration:none;color:inherit}

.header{

  background:#fff;

  border-bottom:1px solid #e7ebf2;

  position:sticky;

  top:0;

  z-index:10;

}

.nav{

  max-width:1100px;

  margin:auto;

  padding:16px 22px;

  display:flex;

  justify-content:space-between;

  align-items:center;

  gap:15px;

}

.brand{font-weight:800;letter-spacing:.2px}

.back{color:#2563eb;font-weight:700;font-size:14px}

.container{

  max-width:900px;

  margin:auto;

  padding:55px 22px 70px;

}

.breadcrumb{

  font-size:14px;

  color:#64748b;

  margin-bottom:22px;

}

.breadcrumb a{color:#2563eb}

.hero{

  background:#fff;

  border:1px solid #e7ebf2;

  border-radius:18px;

  padding:38px;

  box-shadow:0 10px 30px rgba(15,23,42,.05);

}

.badge{

  display:inline-block;

  font-size:12px;

  font-weight:800;

  letter-spacing:1px;

  color:#2563eb;

  background:#eff6ff;

  padding:7px 11px;

  border-radius:999px;

  margin-bottom:15px;

}

h1{

  font-size:42px;

  line-height:1.18;

  margin:0 0 18px;

}

.lead{

  font-size:19px;

  color:#475569;

  margin:0;

}

.notice{

  margin:28px 0;

  padding:16px 18px;

  border-left:4px solid #2563eb;

  background:#eff6ff;

  border-radius:8px;

  color:#334155;

}

.content{

  margin-top:28px;

  background:#fff;

  border:1px solid #e7ebf2;

  border-radius:18px;

  padding:38px;

}

h2{

  font-size:28px;

  line-height:1.3;

  margin:38px 0 12px;

}

h2:first-child{margin-top:0}

h3{

  font-size:21px;

  margin:25px 0 8px;

}

p{margin:0 0 17px}

ul{

  padding-left:22px;

  margin:0 0 20px;

}

li{margin-bottom:9px}

.info-box{

  background:#f8fafc;

  border:1px solid #e2e8f0;

  border-radius:14px;

  padding:20px;

  margin:24px 0;

}

.related{

  margin-top:30px;

  background:#fff;

  border:1px solid #e7ebf2;

  border-radius:18px;

  padding:30px;

}

.related ul{

  list-style:none;

  padding:0;

  margin:15px 0 0;

}

.related li{

  padding:12px 0;

  border-bottom:1px solid #eef2f7;

}

.related li:last-child{border-bottom:0}

.related a{

  color:#2563eb;

  font-weight:700;

}

.footer{

  border-top:1px solid #e7ebf2;

  background:#fff;

  padding:28px 22px;

  text-align:center;

  color:#64748b;

  font-size:14px;

}

@media(max-width:700px){

  .nav{padding:14px 16px}

  .container{padding:30px 16px 50px}

  .hero,.content,.related{padding:24px 20px}

  h1{font-size:32px}

  h2{font-size:25px}

  .lead{font-size:17px}

}

.table-of-contents{

  margin:24px 0;

  border:1px solid #e1e6ee;

  border-radius:12px;

  background:#f8fafc;

  overflow:hidden;

}



.toc-toggle{

  width:100%;

  border:0;

  background:#071b35;

  color:#fff;

  padding:16px 18px;

  font-size:16px;

  font-weight:700;

  display:flex;

  justify-content:space-between;

  align-items:center;

  cursor:pointer;

}



.toc-arrow{

  font-size:18px;

  line-height:1;

}



.toc-content{

  display:none;

  padding:14px 22px;

}



.table-of-contents.open .toc-content{

  display:block;

}



.toc-content ul{

  margin:0;

  padding-left:18px;

}



.toc-content li{

  margin:10px 0;

}



.toc-content a{

  color:#0d3b66;

  text-decoration:none;

  font-weight:600;

}



.toc-content a:hover{

  text-decoration:underline;

}



@media(max-width:600px){

  .toc-toggle{

    padding:15px;

  }



  .toc-content{

    padding:12px 18px;

  }

}

.author-box{

    margin:30px 0;

    padding:20px;

    border:1px solid #ddd;

    border-radius:10px;

    background:#f8f9fa;

}

.author-box strong{

    display:block;

    font-size:18px;

    margin-bottom:5px;

}

.author-box span{

    display:block;

    font-size:14px;

    margin-bottom:12px;

    color:#555;

}

.author-box p{

    margin:0;

    line-height:1.6;

}